JPH0627168A - Radio wave measuring device - Google Patents

Abstract

PURPOSE:To obtain a device for measuring radio waves which can accurately measure a minute signal without any mixture of external noise from a power supply part to a low-noise amplifier. CONSTITUTION:A low-noise amplifier 5 is provided directly below an antenna 1 and is connected to a measuring instrument 7 via a coaxial signal cable 6. A solar battery 10 is placed adjacent to the amplifier 5 as a power supply and furthermore a light source 11 is installed for generation. The voltage which is generated by the solar battery 10 is supplied to the amplifier 5 without any mixture of external noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave measuring device, and more particularly to a measuring device for measuring low level noise from a noise source.

[0002]

2. Description of the Related Art Generally, in a device for measuring low level noise from a noise source such as a personal computer, an extremely small signal received by an antenna is handled, so that a low noise amplifier is provided between the antenna and the measuring instrument. Have been inserted. In such a measuring device, it is necessary to supply power to the low noise amplifier, and a commercial power supply has been conventionally used.
However, in this case, noise was mixed in the power supply line, and the mixed noise level was the limit of measurement. for that reason,
It is possible to use a battery as the power source of the low noise amplifier, but there are problems in terms of maintenance such as life and leakage.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radio wave measuring apparatus capable of accurately measuring a minute signal without mixing of external noise from a power supply unit into a low noise amplifier. It is in. In order to achieve the above object, the radio wave measuring apparatus according to the present invention, as a power source of the low noise amplifier interposed between the antenna and the measuring instrument, the solar cell is directly connected to the low noise amplifier, and the solar cell receives light. A floodlight was provided to project the light.

The solar cell generates power by irradiating light from the light projector and supplies the power to the low noise amplifier. Since the solar cell is installed adjacent to the amplifier, it is not necessary to route the power supply line and noise is not mixed into the amplifier.
Therefore, only a minute signal received by the antenna is amplified and input to the measuring instrument, the lower limit of the measurement level is expanded, and even a minute signal can be accurately measured.

A solar cell generates power by being exposed to sunlight in the daytime. However, due to the nature of noise measurement, this type of measuring device is often used at night or in an anechoic chamber where there is relatively little external noise, rather than being used outdoors during the day. Sometimes needed. By the way, it is preferable to install the low noise amplifier directly below the antenna. With such a configuration, the minute signal received by the antenna is input to the measuring instrument through the signal cable in an amplified state, and the adverse effect of noise mixed in from the signal cable can be eliminated as much as possible.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a radio wave measuring apparatus according to the present invention will be described below with reference to the accompanying drawings. (First Embodiment, FIG. 1) A radio wave measuring apparatus as a first embodiment comprises an antenna 1, a low noise amplifier 5, a measuring instrument 7, a solar cell 10 and a floodlight 11. A personal computer 15 is an object to be measured and is placed on a table 16 made of a non-metallic material. The base 16 is rotatable on a horizontal plane, and the personal computer 15 can be opposed to the antenna 1 at any angle.

The antenna 1 is a broadband antenna and receives low level noise radiated from the personal computer 15.
This antenna 1 is installed on a post 2 via an elevator mechanism (not shown) so that it can be moved up and down and the installation angle can be changed. The low noise amplifier 5 is installed directly below the antenna 1 and is connected to the measuring instrument 7 via a coaxial signal cable 6.

The solar cell 10 has a well-known structure and is directly connected to the low noise amplifier 5 adjacent to it. The projector 11 uses a studio pin spotlight, and the projection angle can be freely set.
Irradiate light on. The solar cell 10 generates power by this light irradiation, and supplies power to the low noise amplifier 5. A small signal (low-level noise) from the personal computer 15 received by the antenna 1 is amplified by the low-noise amplifier 5, input to the measuring device 7 through the coaxial signal cable 6, and its intensity is measured here.

In this embodiment, since the solar cell 10 is directly connected to the amplifier 5, it is necessary to circulate the power supply line if a commercial power supply is used, but this is not necessary and the solar cell 10 is supplied to the amplifier 5. External noise is not mixed in the voltage. Therefore, the minute signal received by the antenna 1 is correctly amplified and transmitted to the measuring instrument 7 through the coaxial signal cable 6. That is, only a signal in which no external noise is mixed is input to the measuring device 7, the lower limit value of the measurement level is expanded, and even a small signal can be measured reliably and accurately.

(Second Embodiment, FIG. 2) In the second embodiment, the low noise amplifier 5 is installed immediately before the measuring instrument 7, and the projector 11 uses an ordinary stand. Other parts are the same as those in FIG. 1, and are denoted by the same reference numerals as those in FIG. In this second embodiment, the personal computer 1 received by the antenna 1
A small signal (low level noise) from 5 is amplified by the amplifier 5 through the coaxial signal cable 6 and immediately input to the measuring device 7. Then, as in the case of the first embodiment, a voltage from which external noise is not mixed is supplied from the solar cell 10 to the amplifier 5, and only the received minute signal is correctly amplified and measured by the measuring instrument 7.

(Other Embodiments) The radio wave measuring apparatus according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. In particular, various types of antennas can be used according to the type of radio wave to be measured, and various types of light projectors can also be used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a radio wave measuring device according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of a radio wave measuring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna 5 ... Low noise amplifier 6 ... Coaxial signal cable 7 ... Measuring instrument 10 ... Solar cell 11 ... Projector 15 ... Personal computer (measurement object)

Claims (1)

[Claims] 1. An antenna for receiving a radio wave from an object to be measured, a measuring instrument for measuring a signal received by the antenna, and low noise interposed between the antenna and the measuring instrument. An electric wave measuring device comprising: an amplifier; a solar cell installed as a power source of the low noise amplifier, adjacent to the low noise amplifier; and a projector for projecting light to the solar cell.